Stop mechanism.



J. KIEWICZ & F. ZALESKI.

STOP MECHANISM.

APPLICATiON FILED FEB.4. 1914.

1 1 82,0 1 '7 Patented May 9, 1916.

2 SHEETS-SHEET I.

o /7 9 34 L Q n 23 49 48 (M M; {f g 8' J. KIEWICZ & F. ZALESKI.

STOP MECHANISM.

APPLICATION FILED FEB. 4. 1914.

2 SHEETS-SHEET 2.

W595, Liz/ewes,

rnn STATES PATENT JOHN KIEWIGZ, 0F HYDE PARK, AND FRANK ZALESKI, OFCAMBRIDGE, MASSACHU- SETTS, ASSIGNORS TO REEGE BUTTON HOLE MACHINECOMPANY, OF BOSTON,- MASSACHUSETTS, A CORPORATION OF MAINE.

STOP MECHANISM.

Specification of Letters Patent.

Patented May 9, 1916.

To all whom it may concern:

, Be it known that we, J oHNKmwIoz and FRANK ZALESKI, citizen of theUnited States of America, and subject of the Ger man Emperor,respectively, residing at Hyde Park, in Norfolk county, and atCambridge, in the county of Middlesex, respectively, State ofMassachusetts, have invented certain new and useful Improvements in StopMechanisms, of which the following is a specification, reference beinghad therein to the accompanying drawing.

This invention relates to stop mechanisms and more particularly to amechanical contrivance associated with the driving mechanisms ofmachines of various sorts for effecting the stoppage thereof in adesirable manner.

and durable stop mechanism adapted to employment with light,fast-rotating machines such as sewing machines, power driven from acontinuously rotating shaft.

Another object is to provide a stop mechanism which is easily controlledand operated and serves to promptly, yet without shock, bring the mainshaft of the machine to rest preferably with the needles or otheroperating parts of the machine ata predetermined point in the cycle oftheir operations.

Other objects hereof will be perceived from the hereinafter followingdescription of an illustrative mechanism embodying the principles ofthis invention. 7

To the attainment of the objects referred to the present inventionconsists in the novel combinations, arrangements, mechanisms, devices,details and other features illustrated or described herein.

Figure 1 is a front elevation partly in section of a portion of amachine embodying a stop mechanism constructed on the principles of thisinvention, the base or frame being shown in section on the plane 11 ofFig. 2. Fig. 2 is a bottom plan view of the parts shown in Fig. 1. Fig.3 is a right elevation of the same. Fig. 1, on an enlarged scale, showsa detail. Fig. 5 is transverse section on theplane 5-5 of Fig. 1,showing the brake drum. Fig. 6 is a rear elevation of the parts in Fig.5, the drum partly broken away. Fig. 7 is'a transverse section on the vplane 7-7 of Fig. 1, showing both the drum and brake band.

An object hereof is to afford an efiicient For convenience ofillustration, the general type of sewing machine, illustrated in priorPatent No. 1,047,537 of December 17th, 1912, has been selected and.suchprior patent may be referred to for the general operation of such amachine and for various details not constituting per se the presentinvention.

The hollow base 9 of the machine supports the stltching mechanism, whichwould be at the left end of the machine and for convenience is omitted,and the driving and stop mechanism which is at the right end, partlyw1th1n and partly without the base. The main shaft 10 extends from thedriving mechanism to the stitching mechanism and operates the needlesand coiiperating parts.

A presser-foot 11 is shown in Fig. 8 carried atrthe forward end of thearm 12 of a swinging lever the shaft 13 of which affords-a pivotalbearing and also carries a second or actuating arm 14 extending withinthe base 10. The arm 14 has at its extremity a stud 15 to permit thelifting of the presserfoot, against spring 16, by a lifting part orswinging arm 17, which is held down by spring 18 so that its stud 19bears on a device or cam 20.011 main shaft 10 as shown. Thereby thepresser-foot is raised automatically when the machine is stopped. Whenthe machine is started the arm 17 is shifted to the left, so that cam 20will not lift the presser-foot, by means later described.

The main shaft is supported in bearings, one of which, 21, is shown, andthe shaft ex tends from the interior of the base through its right handwall to the exterior parts.

Referring now more particularly to the driving and stop mechanism, itinvolves a brake device associated with the rotary shaft 10 orpreferably with a drum constituting substantially an enlarged portion ofthe shaft, together with contacts or lugs upon the shaft and the brakedevice respectively and means for relatively adjusting the contactsendwise; namely, by bodily ad usting the en tire brake device relativelyendwise so as to,

preferably comprises a brake shoe in the form of a band extending nearlyaround the drum, and the contact for operating the brake band isdirectly upon it, so that, when the brake band is shifted endwise, itscontact is brought into alinement with the shaft or drum contact so thatthe braking force is I applied by the machines momentum to effect thestoppage. The drum contact being carried in a resiliently yieldingmanner prevents shock and effects the application of the braking forceprogressively. With the described parts is combined a power uncoupler inthe nature of a belt shifter which may shift a belt to a loose pulley. Asingle means or control part serves in one operation for uncoupling thepower and adjusting the brake device so that the lugs cooperate to bringabout a prompt yet comparatively easy and shockless stoppage in whichinvariably the stitching mechanism or other parts of the machine will bebrought to rest in a predetermined 'position or point. 7

At the right extremity of the main shaft 10 is a hand wheel 22. Near thehand wheel is a loose belt pulley 23 adjacent to a fast belt pulley 24,which, for convenience, may

be formed in one part with a drum 25 secured upon it, so as to rotatewith the main shaft. A belt shifter 28 serves to couple or uncouplepower from the main shaft, this bemg mounted at the end of a sliding rod29 which i is continually pressed toward the right by spring 30, tendingto normally hold the belt on the loose pulley. The spring 30 presses ona collar 31 011 the slide 29 and the collar is engaged by the lower endof a swinging arm 82 downwardly projecting from shaft 33 which, at thefront of the machine, has a second arm 3&- extending horizontally towhere it is provided with a handle 35 or a treadle rod 36, or both. Bynow depressing the treadle rod or handle the arm 32 is swung to the leftand the belt shifted to the fast pulley, the release of the handle ortreadle again restoring the belt to the loose pulley. Y Y 2 Associatedwith the main shaft, or rather with the drum25 forming a portionthereof, is a brake device idwhich may be of various construction but ispreferably as hereinafter described. This brake device is shiftableendwise of the shaft between its inoperative position to the left andits operative position to the right, in which latter it effects thebraking of the drum and shaft in a manner the details of which will behereinafter explained. The brake device is bodily carried upon a slideor rod 41 supported in suitable guides or bearings. It is proposed tomove the slide 41 with or by the slide 29 carrying the belt shifterand,-

although they. could be rigidly connected for this purpose, it ispreferred. that the arm 32'shall actuate them both. 7 Thus a stud 42 isshown on arm 32 engaging a side recess in slide 41. By this arrangementthe brake device and belt shifter may be moved to the right or to theleft in unison and the belt shifter given a greater extent of 'movementthan the brake device. In efiect the arm 32' and the parts which serveto move it constitute a single means for both uncou pling the power andshifting the brake device endwise into operative position, and viceversa.

The brake ClGVlCQflO is shown as comprising a brake shoe or band at?)extending nearly around the periphery of the drum 25. The drum, it willbe noted, is wider than the band so as topermit endwise adjustment ofthe latter without disengagement of the parts.

It should be explained that in all of the figures the parts are shown intheir position when the machine is stopped. 7

The brake device is provided with an extension 46 reaching aroundoppositely to the brake band and overlapping the latter at a point wherethe two are connected by a slot connection &7 permitting the'slightrelative playnecessary for the tightening of the band.

The contacts or lugs may be as follows: The brake band is provided witha contact lug t8 extending laterally rightward from the band. The drum25 is provided with an outwardly extending stop lug d9 adapted to strikethe lug 48 when the lugs are in registry so asto tigaten the band forbraking the drum. The drum is also provided with a check lug 50 forchecking any tendency to rebound, so that, when stopped, the parts arebrought quite definitely to a predetermined position.

F 5, 6, and 7 show more particularly the construction of the drum andlugs carried thereby. The drum is partitioned into two recesses by webconnecting the rim of the drum to its hub 56, which latter is pinned tothe shaft 10; The lug 49, which is intended to yield upon the impact instopping the machine, is formed or mounted upon a casting in the form ofa ring surrounding the hub 56. Thus permitted a limited play of the lug49 in a slot 61 formed in the drum. The casting 60 is provided with. anarm 62 normally engaging a stop 63 formed on the partition 55. Astrongly compressed coil spring 6a is located between arm 62 and a stop65 so as to resist the yielding of the lug 49 and, toincrease theresistance a second such spring 66 is located between the lug 49 and thestop63. The check lug 50'has a slight play in a slot 70 in the drum.This lug is carried on an arm 71 capable of swinging radially andprovided with a pin 7 2 determining its outward position as more clearlyseen'in Fig. 5. The arm 71 is pivoted to a block 73 which extendsthrough an aperture 74L in the partition 55 so that the check lug mayreceive guidance from the other side of the partition as seen in Fig. 7.Referring to Fig. 5, a spring 75 is employed to hold the check lug arm71 in the position shown. Referring to F ig. 7, the block 73 is showncarried upon a casting 76 having a ring form and surrounding the hub 56.This arrangementv permits circumferential movement of the check lug inaddition to the radial swinging movement of its arm 71. Thecircumferential movement is resisted by a strong spring 77 locatedbetween the block 7 3 and the stop 65. It willbe understood that thelugs 49 and 50 are in registry with each other and that the lug 48 onthe brake band is out of registry with lugs 49 and 50 when the machineis running, but in registrywith them when the machine is'to be stopped.The fittings of the check lug-50 are such as to per mit its depressioninto the drum as the lug &8 relatively rides over it so that the lugs 48and 4:9 may meet, the lug 5O resuming its illustrated position andserving to yieldingly check rebound. i

The operation of the machine may be asfollows: The parts are shown instopped position. To restart the machine the arm 35 or treadle rod 36 isdepressed. This swings the arm 32 to the left compressing the spring 30and sliding the slides 29 and 41 to the left. The leftward movement ofslide ll shifts the brake band device to the left, carrying the lug .48out of registry with the lugs 49 and 50, so that the brake device is thearm 82 to the right shifting the beltv to the loose pulley and at thesame time shifting the slide 41 to the right, which carries with it thebrake band, moving the brake band lug 48 into registry with the lugs 49and 50. Immediately the fast moving lug 49 on the drum strikes the brakeband lug 4:8, two things occur. The impact serves to tighten the brakeband for slowing down the drum. At-the same time the momentum carriesthe drum farther, with the result of compressing the springs 6i and 66which, as they are compressed, serve to increase the pressure of lug 49on lug 48 so as to progressively increase the braking force of the bandupon the drum. In this way the momentum of the parts is utilized toefiect their own stoppage with a progressive braking action andaccompanied by a yielding whichavoids shock. The stoppage is peculiarlyeasy, efiective and prompt. As soon as the parts have come to rest thesprings 6%, 66 reassert themselves to the slight extent necessary torestore the parts to the position shown. These reverse movements arepractically insignificant. To prevent any excessive reverse movement orrebound, the check lug 50 comes into play. This lug had been depressedinto the drum by the lug -18 in the act of stopping but it immediatelysprings out to the positions shown in Figs. 5 and 6, so that the lug i8is confined between the lugs 49 and 50 and improper movements preventedas desired. In connection with the stopping and starting operationsdescribed, a certain control of a presser-foct is attainable when theinvention is applied on a sewing machine. Thus the hub 80 of theswinging presser- .foot lifting arm 17'is mounted at the inner end ofthe slide 4:1 which carries the brake device 40. A slotted connection 81is shown permitting the arm to swing yet compelling it to move endwisewith the slide. In the adjustment shown the arm 17 has its stud 19 inoperative position so that the cam 20 has lifted the presser-foot withthe "stoppage of the machine. When the machine is restarted by movingthe slides 29 and ll to the left, the hub 80 and arm 17 are also movedto the left thus carrying the stud 19 to inoperative position wherebythe lifting cam -20 has no efiect upon it during the running of themachine. It will thus be seen that a single means has been provided foruncoupling the power, applying the braking device and causing theautomatic lifting of the presser-foot upon the stoppage of the machine,and in restarting restoring all of these parts to their previousposition.

It will thus be seen that there has been de scribed a stop mechanismembodying the features and attaining the objects and advantages referredto and further advantages will be apparent to those skilled in the art.Since many matters of arrangement, design, detail and other features maybe varied without departing from the principles hereof, no limitation tosuch features intended excepting so far as specified in 'the appendedclaims.

What is claimed is:

1. In combination, a rotary shaft having a drum portion, a brake deviceadjacent said drum comprising a shoe and an impact stop lug on the shoe,a stop lug carried by the drum, means for adjusting said device.

endwise of the shaft to bring the lugs into or out of registry, and acheck lug carried by and projecting from the rotary drum in alinementwith the stop lug and capable of depression into the drum interior bythe shoe lug riding over it.

by and projecting from the rotary drum in alinement With the stop lugand capable of depression into the drum interior by the shoe lug ridingover it and of yielding upon a rebound of the drum.

3. In combination a rotar shaft havin a drum portion, a brake deviceadjacent said drum comprising a shoe and an impact stop lug on the shoe,a stop lug carried by the drum, a loose belt pulley adjacent the drumand a single means for shifting a belt from and to the drum to and fromthe loose pulr ley, and for adjusting said device endwise of the shaftto bring the lugs into or out of registry, whereby the shaft will beslowed by said brake band and positively stopped by said lugs.

4:. In combination, a rotary shaft carrying a drum and an impact stoplug, a brake device comprising a. shoe and an operating lug which alsoserves as an impact stop lug, a slide substantially parallel to saidshaft carrying the brake device, and means for shifting the slide tobring the lugs into registry, whereby the shaft applies its own brakeand said lugs give a positive final stop.

5. In combination, a rotary shaft carrying a drum and an impact stoplug, a brake device comprising a shoe and an operating lug which alsoserves as an impact stop lug, a slide substantially parallel to saidshaft carrying the brake device, a power uncoupler, and a single meansfor operating said uncoupler and for shifting the slide to bring thelugs into registry, whereby the shaft applies its own brake and saidlugs give a positive final stop.

In testimony whereof we afiix our signatures in presence of twowitnesses. l JOHN KIEWVICZ.

FRANK ZALESKI. Witnesses: r

F A. SHEA, A. P. SGHOENKY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G. V i

